WASHINGTON, Dec 21 (Reuters) - The United States will provide $1.85 billion in additional military assistance for Ukraine, including a transfer of the Patriot Air Defense System, Secretary of State Antony Blinken said on Wednesday.The announcement came as Ukrainian President Volodymyr Zelenskiy arrived in Washington to meet President Joe Biden and address Congress in his first known overseas trip since Russia invaded Ukraine 300 days ago."Today's assistance for the first time includes the Patriot Air Defense System, capable of bringing down cruise missiles, short range ballistic missiles, and aircraft at a significantly higher ceiling than previously provided air defense systems," Blinken said in the statement released by the U.S. State Department.The Pentagon said the aid package would also include ammunition for high-mobility artillery rocket systems (HIMARS), precision-guided artillery rounds and precision aerial munitions.Zelenskiy said earlier that his U.S. visit was meant to strengthen Ukraine's "resilience and defense capabilities" amid repeated Russian missile and drone attacks on the country's energy and water supplies in the dead of winter."